Improvement in machines for turning crank-pins



that@ iait MTLToN cQWOoD, oF BoSToN, MASSACHUSETTS.

Letters Patent No.1,13,959, dated April 18, 1871.

MPRQVEMVENT IN MACHINES FOR TURNING CRANK-PINS.

The Schedule referre to in these Letters Patent and making part of the same.

I, MILTON G. Woon, of Boston, in the State of Massachusetts, have invented an Improved Crank-Pin Lathe, suitable also for turning journals or shafting at or near the ends, of which the following is a specication, -which, with the accompanying drawing, being a perspective view ofthe apparatus in. position and ready to work, will .enable a competent mechanic to construct'and operate a machine of my invention without inveutionor contrivance of his own.

The object of this invention is to turn the crank-pins of locomotives and other like articles, such as the journals of shafts made and designed for thrust-bearings, or.

any other shafts having collars upon them or buttons upon the end, or for any shaft where a button may be attached to the end by a screw-bolt having a center counter-sunk in its head when Wornout of true.

It consists in organizing into a frame tting over the crank-pin, shaft, or journal, a spur-center and a ring with adjustable gibs, so as to center the frame upon the axis of the crankl-pin; and in mounting upon said frame a tool-stock and tool, Withits feeding device; and in arranging upon the frame a movable or adj nstable buttress, which presses one side of the collar or button, while the spur-center presses the other; and` It further consists in the arrangement of. an automatic feeding device by means of a loose handle held from revolution during the revolution of the machine,

and thus operating a belt,lwhich connects such handle with the feeding-wheel and tool-screw, forming the'feed. Nearly all the journals used in locomotives or on cars have buttons on the end, such as the truck-Wheels, the crank-pins, the coupling-pins foi` the parallel-rods when the engine has inside connections7 and thus this lathe is invaluable in a railway repair-shop; while, if desired to turn a shaft not having a button, by tapping into the end ofthe shaft, a button maybe temporarily screwed onto its end, and a countersink made in the head of the screw, holding it to the shaft, or at a point coinciding with the axis of the Shaft, and this will answer every purpose.

Propeller-shafts, too, when they lie in the plummetblocks, or other thrust-bearings, may be more readily turned true by this than by the means now in use. v

. The combination, it will be seen by reference to the accompanying drawing, can be reduced to very few elements.

A is a frame, formed of a single casting, the different parts of which, uniting to produce the desiredreffeet, are as follows:

The ring b, carrying three adjustable gibs, c, to accurately center the ring b upon the unworn shoulder of the pin or journal, or on any collar or part of the shaft, which is turned to a true circle about the axis of the journal; V

The bent arm d e, which serves to complete the centering of the whole frame by means ofthe spur-centerf, driven through arm e, and also'serves as the actuatingarm; and

The tool-ways g, extending fromactuating-arm e to the face of ring 7b.

The frame A is, then, composed of ring b, with its gibs c, adjustable on a radial line; of tool-ways g and arm d, perpendicular to the face of ring b,- of arme, uniting the armv d and tool-ways g, and extending beyond them, to serve as an 'actuating-arm; and of spurcenter j', to be driven down on the axis of the piu or journal, and, when in place, held by checksn'ut k.

This constitutes the frame of the lathe, and is the rst element.

Arm d of this frame is slotted, as shown, and an adjustable buttress, B, is placed upon it, which may4v end play being avoided by the` opposite pressures of spur-center f and buttress B on opposite sides of the same button.

Upon the tool-ways g I then mount a tool-stock, h, carrying a tool, j, fixed in its relation to the work by holding-screw fm.

Through the bottom of the tool-stock is cnt a nut, in which plays the feed-screw'n, which is actuated by belt-wheel o, which last may, if desired, be used as a hand-wheel. But it is betterI to actuate belt-wheel o by a belt, 12 which passes also over round handle g.

This handle is loose in the arm e, and', when feed.-

in g, the tool must be held from revolution with the arm,

It is best "to begin with the tool at the point of- Igreatest wear-generally half way along the pinand turn in each direction, finishing the work with a second thin shaving, taken by around-nosed tool.

An apparatus of this sort,- in eight hours, has' turned off a set of four pins by one mans labor to turn the crank, and the whole cost of apparatus and labor was less than the cost oi' renewing a set of pins. I disclaim the organization and arrangement of parts shown in P. Maltbys patent of December l5, 1868; and

I claim and desire to secure by Letters' Patent-- The combination of loose handle-q, belt'p, either straight or crossed, belt-wheel o, frame A, and feed- `screw n,,operatingsubstautially as described.

Viitnesses: MILTON G. WOOD.

'.DHos. WM. CLARKE, GEO. R. CLARKE. 

